 
        .boxbg{
            width: 800px;
            margin: 0 auto;
        }
        .boxbgdiv{
            width: 800px;
            margin: 0 auto;
        }
        .lbt .imgBox{
            position: relative;
            bottom: 525px;
            width: 50%;
            height: 500px;
            margin: 0 auto;
            background-image: url(./img/imgboxbg.png);
        }
        .lbttxt{
            width: 180px;
            margin: 0 auto;
        }
        .lbt .imgBox img{
            width: 60%;
            height: 350px;
            margin: 0 auto;
            padding-top: 30px;
        }

        .lbt .img1{
            display: block;
        }

        .lbt .img2{
            display: none;
        }

        .lbt .img3{
            display: none;
        }

        .lbt .img4{
            display: none;
        }